• Ingo Molnar's avatar
    x86: disable X86_PTRACE_BTS · 40f15ad8
    Ingo Molnar authored
    there's a new ptrace arch level feature in .28:
      config X86_PTRACE_BTS
      bool "Branch Trace Store"
    it has broken fork() handling: the old DS area gets copied over into
    a new task without clearing it.
    Fixes exist but they came too late:
      c5dee617: x86, bts: memory accounting
      bf53de90: x86, bts: add fork and exit handling
    and are queued up for v2.6.29. This shows that the facility is still not
    tested well enough to release into a stable kernel - disable it for now and
    reactivate in .29. In .29 the hardware-branch-tracer will use the DS/BTS
    facilities too - hopefully resulting in better code.
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Kconfig.cpu 16.2 KB